Acknowledgments

Special thanks go to Norman Schmidt, Jose Maria Velasco, Jim Ablett, Jon Dart, Andrey Chilantiev, Quoc Vuong and Corey Abshire for their contributions, help and advice. A 130x65 Firenzina logo is based on a fragment of a classic public domain portrait of Giovanna Tornabuoni by Domenico Ghirlandaio. The second Firenzina logo is by Dusan Stamenkovic of ChessMosaic.